Article 63 of the French Code of Criminal Procedure
I.-Only a judicial police officer may, ex officio or on the instructions of the public prosecutor, place a person in police custody. As soon as the measure begins, the judicial police officer informs the public prosecutor, by any means, of the person’s placement in police custody. He shall inform him of the reasons justifying, pursuant to Article 62-2, this placement and inform him of the classification of the facts that…